Hammer mill



Nov. 17, 1931.

M. M MILLAN ET AL HAMMER MILL Filed Feb. 24, 1930 I I Vf/VTORS MILTON m llunu Roesnr 3. Mac/Mum 4 3 LP}. 8 7 HI II 7 V 11 11 i II I. I! ,I 1 v I III I l I v IMHU HHU- E A 1 5 u v 5 a 8 Patented Nov. 17, 1931 A UNITED STATES PATENT OFFICE MILTON MCMILLAN, OF ANAHEIM, AN D ROBERT S. MACMILLAN, LONG BEACH, CALI- FORNIA; SAID ROBERT S. MACMILLAN, ASSIGNOR, BY MESNE ASSIGNMENTS, OF ONE- TENTI-I T0 GEORGE ADAMS ROALFE, OF LONG BEACH, CALIFORNIA HAMMER MILL Application filed February 24, 1930. Serial No. 430,596.

This invention relates to a hammer mill whereby rock or any other hard or fragile substance is broken up into a finely divided state.

An object of our invention is to provide a hammer mill, the hammers rotating in a plane at right angles to the direction of flow of the material acted upon,

Another object is to provide a mill requiring less weight and which has a greater rate of output than mills of the usual arrange ment.

A further object is to provide a mill which can be quickly and easily assembled or disassembled for purposes of repair or cleaning.

Other objects, advantages, and features of invention may appear from the accompanying drawings, the subjoined detailed description and the appended claims.

In the drawings Figure 1 is a longitudinal, sectional view of our mill, the hammers and mounting being shown in elevation.

Figure 2 is a fragmentary, transverse, sectional view of the segregating ring.

Figure 3 is a sectional view taken on line 33, Figure 1.

Referring more particularly to the drawings, the numeral 1 indicates an outer cylindrical shell provided with flanges 2-3 on the top and bottom thereof, respectively. A conical hood 4, is bolted or otherwise suitably secured to the top of the shell 1, and an intake chute 5 extends into the side of the hood l. An outlet apron 6 is secured to the bottom of the shell 1, preferably by bolting or other similar means. The outlet apron being preferably frusto-conical in shape. A segregating ring 7 is mounted inside of the shell 1 and rests on a seat 8 at the bottom. The ring 7 is preferably frusto-conical in shape and tapers inwardly at the bottom. However, for the treatment of certain materials it may be desirable to invert the ring so that the smaller diameter is at the top.

A plurality of annular, horizontally extending ribs 9 project inwardly from the ring 7 the purpose of these ribs being to segregate the material, as will be further de ners 18 are secured between the discs 16-17,

preferably by means of bolts which extend through the discs into the hammers. lVith 65 this arrangement the hammers can be indivi'dually removed and replaced when necessary. The hammers extend radially about the shaft 10, and the lowermost rib 9 is set close to the bottom of the hammers so that a;- 7 finely divided material can pass between said rib and the hammers and thence outwardly through the outlet apron 6.

The bottom of the shaft is supported in a spider 19 which encloses the bearing 12.,75

The'spider 19 is preferably secured between the flange3 and the outlet apron 6. Between adjacent pairs of ribs 9 we provide vertical baffles 20 to prevent racing of the material between the ribs. The space abovm o the uppermost rib is not provided with baffles so that an even distribution of material is accomplished to the hammers; It will be evident that the material is fed past the hammers by gravity as soon, as the material ha sufii'ciently small to pass between the rib and the hammers.

The hammers rotate at a high speed and due to the fact that a partial vacuum is pro vided behind the hammers, there is no blow o ing effect which would tend to disburse the material or to disrupt its flow.

Having described our invention, we claim: 1. A hammer mill comprising a shell, an

, intake chute at the top of the shell, an outlet apron at the bottom of the shell, a vertical shaft extending into the shell, means journaling said shaft in the shell, means to rotate said shaft, a plurality of hammers secured to said shaft and extending radially therefrom; 10c

and a frusto-conical distributing ring mounted in the shell and surrounding said hammers, and said ring tapering inwardly towards the bottom whereby the material is gradually reduced in size as it falls through the mill.

2. A hammer mill comprising a shell, an intake chute at the top of the shell, an outlet apron at the bottom of the shell, a vertical shaft extending into the shell, means journaling said shaft in the shell, means to rotate said shaft, a plurality of hammers secured to said shaft and extending radially therefrom, and a frusto-conieal distributing ring mounted in the shell and surrounding said hammers, a plurality of spaced horizontally extending ribs on said ring, said ribs projecting inwardly towards the hammers, and said ring tapering inwardly towards the bottom whereby the material is gradually reduced in size as it falls through the mill.

3. A hammer mill comprising a shell, an intake chute at the top of the shell, an outlet apron at the bottom of the shell, a vertical shaft extending into the shell, means journaling said shaft in the shell, means to rotate said shaft, a plurality of hammers secured to said shaft and extending radially therefrom, and a frusto-conical distributing ring mounted in the shell and surrounding said hammers, a plurality of spaced horizontally extending ribs on said ring, said ribs projecting inwardly towards the hammers, and a plurality of vertically spaced bafiles between adjacent pairs of said ribs.

4. A hammer mill comprising a shell, an intake chute extending into the top of the shell, an outlet apron depending from the bottom of the shell, a vertical shaft extending into the shell, means journaling said shaft in the shell, means to rotate said shaft, a pair of spaced discs on the shaft, a plurality of hammers secured to said discs and extending therebetween, said hammers projecting radially from the discs, a frustoconical distributor ring mounted in the shell and surrounding said hammers and a plurality of inwardly extending spaced horizontal ribs on said ring, and said ring tapering inwardly towards the bottom whereby the material is gradually reduced in size as it falls through the mill.

A hammer mill comprising a shell, an intake chute extending into the top of the shell, an outlet apron depending from the bottom of the shell, a vertical shaft extending into the shell, means journaling said shaft in the shell, means to rotate said shaft, a pair of spaced discs on the shaft, a plurality of hammers extending radially from the discs, means removably securing the hammers to the discs, a frusto-conical distributor ring surrounding said hammers, a plurality of spaced inwardly extending horizontal ribs tures.

MILTON MoMILLAN. ROBERT S. MACMILLAN. 

